微阀

Abstract(#br)A microfluidic device containing a constructal-based branched flow structure with an externally controllable complexity was developed and tested in this study. The device was fabricated in the form of a 10\u003cce:hsp sp=\"0.25\"/\u003emm square by 9\u003cce:hsp sp=\"0.25\"/\u003emm high monolithic silicon/polydimethylsiloxane (PDMS) test section which contains three interconnected flow channels in a tee configuration.

An electromagnetic microvalve for pneumatic control of microfluidic devices has been designed, fabricated, and tested. The microvalve is composed of two parts: a miniature electromagnetic actuator and a valve body. The electromagnetic actuator consists mainly of a thin polydimethylsiloxane (PDMS)–based elastomer, which acts as the valve diaphragm. The diaphragm, used as a solid hydraulic medium, converts the large contact area of a valve core into a small contact area of valve head while maintaining a large stroking force.

Fabrication and Characteristics of Thermopneumatic-Actuated Polydimethylsiloxane Microvalvemicrovalve;thermopneumatic-actuation;PDMS;ITO heater;membrane;A normally open thermopneumaticc-actuated microvalve has been fabricated and their properties are investigated. The advantages of the proposed microvalve are of the low cost fabrication process and the transparent optical property using polydimethylsiloxane (PDMS) and indium tin oxide (ITO) glass. The fabricated microvalves with in-channel configuration are easily integrated with other microfluidic devices on the same substrate.